fix: 修复 CI/CD 工作流 - 移除 actions/checkout 依赖

## 问题
- actions/checkout@v4 需要 Node.js 环境
- Gitea Act Runner 默认镜像没有 Node.js
- 导致 "Cannot find: node in PATH" 错误

## 解决方案
- 使用原生 git 命令代替 actions/checkout
- 在 install job 中安装 Node.js 环境
- 所有 checkout 步骤改为 git clone

## 优点
- 不依赖 GitHub Actions 插件
- 完全使用原生命令，更稳定
- 适合国内服务器环境

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -13,7 +13,15 @@ jobs:
   install:
     runs-on: [self-hosted, rent-deploy]
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        run: |
+          git clone --depth 1 --branch ${GITHUB_REF#refs/heads/} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+          git checkout ${GITHUB_SHA}
+
+      - name: Setup Node.js
+        run: |
+          curl -fsSL https://deb.nodesource.com/setup_18.x | bash -
+          apt-get install -y nodejs
 
       - name: Install dependencies
         run: |
@@ -25,7 +33,10 @@ jobs:
     runs-on: [self-hosted, rent-deploy]
     needs: install
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        run: |
+          git clone --depth 1 --branch ${GITHUB_REF#refs/heads/} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+          git checkout ${GITHUB_SHA}
 
       - name: Build shared packages
         run: |
@@ -52,7 +63,10 @@ jobs:
     needs: build
     if: github.ref == 'refs/heads/prod'
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        run: |
+          git clone --depth 1 --branch ${GITHUB_REF#refs/heads/} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+          git checkout ${GITHUB_SHA}
 
       - name: Deploy to production
         run: |
@@ -74,7 +88,10 @@ jobs:
     needs: build
     if: github.ref == 'refs/heads/test'
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        run: |
+          git clone --depth 1 --branch ${GITHUB_REF#refs/heads/} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+          git checkout ${GITHUB_SHA}
 
       - name: Deploy to test
         run: |